What is the role of a Level 1-2 router in IS-IS?

It only routes within its own area and does not participate in Level 2.

It maintains separate link-state databases for Level 1 and Level 2 and acts as a gateway between areas.

It is used only in broadcast networks to elect a designated router.

It only routes between areas and does not participate in Level 1.

A service provider is designing a new IS-IS network with multiple areas. They have a mix of Level 1, Level 2, and Level 1-2 routers. The network engineer wants to ensure that Level 1 routers in one area can reach prefixes in another area without relying on a default route. What must be configured to achieve this?

Configure route leaking on the Level 1-2 routers to advertise specific prefixes from Level 2 into Level 1.

Configure all routers as Level 2 to ensure full routing information is exchanged.

Configure the Level 1-2 routers to set the attach bit in their Level 1 LSPs.

Configure the Level 1 routers to have a static default route to the Level 1-2 router.

What is the purpose of the IS-IS hello protocol?

To calculate the metric to each neighbor.

To elect the designated router on point-to-point links.

To discover neighbors and establish adjacencies.

To exchange routing tables between neighbors.

Juniper NetworksCertified Professional, Service Provider Routing and Switching (JNCIP-SP)

Domain 2Objective 1

IS-IS Concepts and Operation JN0-664 Practice Questions (Page 4)

Part of the IS-IS domain, which makes up ~18% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–11 in this domain), expect 1–1 from this objective — we provide 25 practice questions to prepare you well beyond it. (estimate)

25questions here

5free pages

10concepts

Questions 16–20

16foundation · easy
What is the role of a Level 1-2 router in IS-IS?
Select an answer first
17application · medium
A service provider is designing a new IS-IS network with multiple areas. They have a mix of Level 1, Level 2, and Level 1-2 routers. The network engineer wants to ensure that Level 1 routers in one area can reach prefixes in another area without relying on a default route. What must be configured to achieve this?
Select an answer first
18foundation · easy
What is the default metric value for an IS-IS interface?
Select an answer first
19application · medium
A service provider is designing a new IS-IS network with multiple areas. They have a router that will be placed at the border of two areas. This router needs to maintain the full routing table for both areas and advertise routes between them. What type of router should this be?
Select an answer first
20foundation · easy
What is the purpose of the IS-IS hello protocol?
Select an answer first

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IS-IS Concepts and Operation JN0-664 Practice Questions (Page 4)

Questions 16–20

What is the role of a Level 1-2 router in IS-IS?

What is the default metric value for an IS-IS interface?

A service provider is designing a new IS-IS network with multiple areas. They have a router that will be placed at the border of two areas. This router needs to maintain the full routing table for both areas and advertise routes between them. What type of router should this be?

What is the purpose of the IS-IS hello protocol?

Keep studying — IS-IS